Q: Which of the following equations correctly represents the overall reaction for aerobic cellular respiration?

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} \rightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + \text{energy}$$

Question 1

Which organelle is primarily responsible for the majority of ATP production during aerobic respiration in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 2

Which of the following best describes the role of NAD+ in cellular respiration?

Accepted Answer

It functions as an electron carrier, accepting electrons during redox reactions.

Question 3

During glycolysis, ATP is produced by which mechanism?

Accepted Answer

Substrate-level phosphorylation

Question 4

Which of the following equations correctly represents the overall reaction for aerobic cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} ightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + 	ext{energy}$$

Question 5

In which cellular compartment does the citric acid cycle occur?

Accepted Answer

Mitochondrial matrix

Question 6

Which step in glycolysis is an example of substrate-level phosphorylation?

Accepted Answer

Step 7: Conversion of 1,3-bisphosphoglycerate to 3-phosphoglycerate

Question 7

What is the net yield of ATP, NADH, and pyruvate from one molecule of glucose after glycolysis?

Accepted Answer

2 ATP, 2 NADH, 2 pyruvate

Question 8

Which reaction links glycolysis to the citric acid cycle, and what are its products?

Accepted Answer

Pyruvate oxidation; products are acetyl-CoA, CO$$_2$$, and NADH

Question 9

Which of the following is a correct description of oxidative phosphorylation?

Accepted Answer

ATP is synthesized using energy from a proton gradient generated by the electron transport chain.

Question 10

How many NADH molecules are produced per turn of the citric acid cycle from one acetyl-CoA?

Accepted Answer

3

Question 11

Which of the following statements about the electron transport chain (ETC) is correct?

Accepted Answer

Electrons from NADH and FADH$$_2$$ are transferred through a series of protein complexes, ultimately reducing O$$_2 to H$_2O.$$

Question 12

What is the main purpose of fermentation in the absence of oxygen?

Accepted Answer

To regenerate NAD+ so glycolysis can continue

Question 13

Which of the following best explains why the citric acid cycle is considered part of aerobic metabolism, even though O$$_2$$ does not appear in any of its reactions?

Accepted Answer

The NADH and FADH$$_2$$ produced are oxidized by the electron transport chain, which requires O$$_2 as $$the final electron acceptor.

Question 14

Calculate the theoretical maximum yield of ATP from the complete oxidation of one molecule of glucose in aerobic respiration.

Accepted Answer

$$32$$ ATP

Question 15

Which of the following is an example of feedback inhibition in cellular respiration?

Accepted Answer

High levels of ATP inhibit phosphofructokinase in glycolysis.

Question 16

Which of the following statements about substrate-level phosphorylation and oxidative phosphorylation is correct?

Accepted Answer

Substrate-level phosphorylation directly transfers a phosphate group to ADP from a phosphorylated intermediate.

Question 17

Which of the following is a product of lactic acid fermentation?

Accepted Answer

Lactate

Question 18

If the enzyme catalyzing reaction six of glycolysis is inhibited, what would happen to the concentration of glycolytic intermediates before and after the affected reaction?

Accepted Answer

Intermediates before reaction six would accumulate, while those after would decrease.

Question 19

Which of the following best describes the chemiosmotic mechanism of ATP synthesis?

Accepted Answer

ATP is synthesized as protons flow through ATP synthase, driven by a proton gradient across the inner mitochondrial membrane.

Question 20

Which of the following statements about the regulation of energy pathways is correct?

Accepted Answer

High ADP levels activate key enzymes in ATP production.

Cellular Respiration: Pathways That Harvest Chemical Energy

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